Light appears to travel in straight lines since

Options

A. It is not absorbed by the atmosphere
B. It is reflected by the atmosphere
C. It’s wavelength is very smal
D. It’s velocity is very large

Answer

To answer the question "Light appears to travel in straight lines since," we can break down the reasoning step by step:

### Step-by-Step Solution:

1. **Understanding Light Propagation**: Light is an electromagnetic wave that travels through space. When we say light travels in straight lines, we mean it follows a linear path without bending or curving.

**Hint**: Consider the nature of light and how it behaves in a vacuum or uniform medium.

2. **Defining Diffraction**: Diffraction is the bending of light waves around obstacles or through openings. The extent of diffraction depends on the wavelength of the light relative to the size of the obstacle or aperture.

**Hint**: Think about how waves behave when they encounter barriers or openings.

3. **Wavelength of Light**: The wavelength (λ) of visible light is relatively small, typically around 400 to 700 nanometers. This small wavelength means that light does not bend significantly when it encounters objects or openings that are much larger than its wavelength.

**Hint**: Recall the relationship between wavelength and diffraction; smaller wavelengths lead to less diffraction.

4. **Conclusion**: Since the wavelength of light is small, it experiences minimal diffraction. As a result, light appears to travel in straight lines because it does not deviate significantly from its path.

**Hint**: Summarize the relationship between wavelength and the straight-line propagation of light.

### Final Answer:
Light appears to travel in straight lines since its wavelength is small, leading to minimal diffraction.